Date: Mon, 19 Nov 2007 11:57:23 +0800 From: Dinesh Nair <dinesh@alphaque.com> To: Manolis Kiagias <sonicy@otenet.gr> Cc: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>, freebsd-questions@freebsd.org Subject: Re: hyperthreading CPU and broken scheduling? Message-ID: <20071119115723.0701c02a@prophet.alphaque.com> In-Reply-To: <4740140C.6050103@otenet.gr> References: <20071118111446.H4507@wojtek.tensor.gdynia.pl> <4740140C.6050103@otenet.gr>
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On Sun, 18 Nov 2007 12:29:32 +0200, Manolis Kiagias wrote: > Wojciech Puchar wrote: > > i have machune with intel's CPU with hyperthreading. > > > > it is detected right, but only first thread is ever used. > > > > top shows at least 50% idle no matter what i run! > > > > what's wrong? > To enable hyperthreading, try setting the following in /etc/sysctl.conf: > > machdep.hyperthreading_allowed=1 > > and reboot (or execute sysctl machdep.hyperthreading_allowed=1 by hand). would an SMP kernel be required to properly use hyperthreading, or would just the above sysctl setting be enough ? -- Regards, /\_/\ "All dogs go to heaven." dinesh@alphaque.com (0 0) http://www.openmalaysiablog.com/ +==========================----oOO--(_)--OOo----==========================+ | for a in past present future; do | | for b in clients employers associates relatives neighbours pets; do | | echo "The opinions here in no way reflect the opinions of my $a $b." | | done; done | +=========================================================================+
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